Seven sites are connected via OTV, what is the best practice to connect more than tree multicast sites using OTV

Question

Options

• AFilter MAC address at the join interface
• BUse multicast-enabled transport
• CUse Unicast-only transport
• DConfigure one edge device for each data center

• A
  16% (6)
• B
  76% (28)
• C
  5% (2)
• D
  3% (1)

Explanation

Overlay Transport Virtualization (OTV) supports both multicast and unicast transport modes. When connecting more than three sites, the best practice is to use a multicast-enabled transport network. Multicast transport allows OTV to efficiently distribute BUM (Broadcast, Unknown unicast, Multicast) traffic using a multicast delivery tree across all sites, avoiding the O(n²) unicast adjacency mesh that unicast-only mode would require. Unicast-only transport (Option C) becomes operationally complex and inefficient as the number of sites grows. Filtering MAC addresses at the join interface (Option A) is a traffic optimization technique, not a scaling solution. Configuring one edge device per data center (Option D) is a general OTV best practice for redundancy, not specific to scaling multicast beyond three sites.

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